"All he wanted was peace in his mind," she said. "That's all he wanted."

King's father, Matt King, said his son was diagnosed with schizophrenia at the age of 20 and was not a violent person.

"Brad was the most kindhearted personality you ever met in your life," he said. "He put a smile on everyone's face."

The Hendricks County sheriff's department said two reserve deputies went to the house to check on the welfare of a man after dispatchers got two calls from King at his home. The deputies encountered King in the backyard after no one answered the front door. No officers were injured.

Reserve deputies are volunteer officers, who receive 40 hours of training and complete required field work before joining the department, said Hendricks County Sheriff's Capt. Amanda Goings.

Robertson said that although she supports law enforcement, fatal shootings like the one involving her nephew should not happen.

"If he wouldn't have called the cops, he would have still been here today," she said. "Until it happens to everybody and some of their family, no one's going to understand."